Preparation:Place roast on a large sheet of heavy duty foil and sprinkle with liquid smoke and soy sauce. Wash unpeeled bananas and place at the base of the roast each side. Fold foil around meat and wrap again in another piece. Place in shallow baking dish. Marinate overnight. Turn several times. Next day, place foil wrapped meat in roasting pan. Bake at 400 degrees for 1 hour. Reduce heat to 325 degrees and bake for 3-1/2 hours. Drain all liquid and discard bananas. Shred meat.